77161806 has 48 divisors (see below), whose sum is σ = 171007200. Its totient is φ = 25139520.

The previous prime is 77161787. The next prime is 77161807. The reversal of 77161806 is 60816177.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77161807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220920 + ... + 221268.

It is an arithmetic number, because the mean of its divisors is an integer number (3562650).

Almost surely, 2^77161806 is an apocalyptic number.

77161806 is an abundant number, since it is smaller than the sum of its proper divisors (93845394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77161806 is a wasteful number, since it uses less digits than its factorization.

77161806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 77161806 is about 8784.1793014487. The cubic root of 77161806 is about 425.7298757002.

The spelling of 77161806 in words is "seventy-seven million, one hundred sixty-one thousand, eight hundred six".